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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151af8650456aee048564bbc5061c38fb9944d79dd5c9f21d8e089969f1f80ec' 
  AND token = '3I9fntatocmXzSbk/rD50mHwtNFedcL+fAsZ2DJd7Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}