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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027415da76258c99504360113701901ca7902e06d9bfde005cea97a851312b0d' 
  AND token = 'gxHYL34m7M/h7AciS7ECxQc3z4hylLPwPm1A6KlHRuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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