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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26290dfa0e3e4c28e0193bf4255abd8d7a404a614c3a9ceb4234db6ccb84f82' 
  AND token = 'MPawsZZwrojsJpFLVS1wudzNxKIm/DESkaYsgQNO3Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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