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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0925c0cb0653da8a050089691890fc3f804256064aa17e69dac631a53882c1f' 
  AND token = 'aVfefTlLwWu/QmQA4o/OTYShj/GXtinqkeuqTKnQV8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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