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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276692d07e537b4c6b444ca01833000f650482ef6b0839a7ad3ddc7bb35a5e4a' 
  AND token = '6uXUszPxgzUY9ztJSTMd5928UnC2dw8UheTdqcilzrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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