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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8efb2511554e9d844ed7d4b723f683932a319a74a179491d02a7d4976a6675b9' 
  AND token = 'ijb4+y+q1qM1p/nSggtxrUuFfrOHt2/L0HsW71GdGcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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