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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e65be4d76dcfffc100a3fe39cc01daa3dc3e91e0ff4a02f8e4cbed55d6f2e9' 
  AND token = 'hVWkqQvpuTf8psDeMc6lK8yV1BrVFYLk61NLWg40bjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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