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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2b9b0e52d4c3fcc8364f9e051f117f6d905ee68943683a0efc0a879d113489' 
  AND token = 'xHzmuvapo3qsuh4nc9f53BEDxSEY583QCOTuSsIdHRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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