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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8de368e6a5550c68cb85364b76765e04387f7200b5772e0fd35cae2635a2be' 
  AND token = '4drTW2C4d5QyEF38dDYCctBZmpyV0UaximkqoI1QRQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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