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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaec59ed633a7788613569c2d556ed478be5cdd08230197359fd5a640bfb12d4' 
  AND token = 'pVcryEChIQmin2HIfKoPiiSFLqB1Dqc/pn6vs44unz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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