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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b00d67c04f1d0f5bd5b80eb9b02b9e8f68fa9ec8210f0ddbb07e8674b8da62' 
  AND token = '1nWbpeeU7ycpa7zyb9STkrNz5AGvqxAby0eNdpdH33A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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