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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2abe930beb1f412af5317cd98d7b6a6297f9ea1f48265bd6faac91eb9e26503' 
  AND token = 'A0z8DNPbyIn7ZSAeT8ixtB+in+sohZeHZxcWJXUfIqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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