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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0076fdb4c5ba67b8d193c0d2a414f51f79513cfb400092d46a3698336b9c8ebd' 
  AND token = 'hyNLQ401tf8S6BINhm2QioWLTYR7WavXikohmpz9iE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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