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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032709378c4abb57665b45db1d9bb0e987334c957078a7dd3158d8a04be86700' 
  AND token = 'epgmcGOOFHg++wdwG0gI0gkZqr9Ptp09Rd7aXrw5y8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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