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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39eef9e3ee4ba4fef4c3472e48fbaa0029bda9da54725739592662a45eedeb26' 
  AND token = '2et4TNKQFvMZDiisXtPnh1npuMm1ZDeJUBUrTfedzhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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