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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5de8c36e1f830f5b8ba6d30eb9abf08669977565d21cae5cb150ef62588fd51' 
  AND token = 'yc0EPqmtQexJQ5iHVZr17Qg3EWs+VWPSnu+DfnJ9FC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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