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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be643a9178164f05e7b4c4983b900587afabede3ed0a8658d6bc1ca652ca5eca' 
  AND token = 'IQO6FphQ4IKzdTDYIs7m6vg40jpq6ZFj+9N3gjuHpd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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