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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2a84fadef707722fc6ed570f8ef14d4c6be1d6b0b931c59d5c0fe88d0cca18' 
  AND token = 'CrBzmC9qaPLvGq/WNV4LMQ90K9d0c3KcRfS1el47zvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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