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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8986fb64018a4aeba53d9af0ec0b6050e8bcf4daf1f0c8743c51ffdafdc84d55' 
  AND token = 'TuoOpyLy8A6toTtG9F6in+h7AiD4ZtFnEy1c9nMflZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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