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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59e132a057268fa91130731a60ec7f5d5d5afd0d1bde9f6b40aa4f411e61cb5' 
  AND token = 'rAWDQuXEscfsOVbiu+VMiRU6OYro17WA1dPK76isq54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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