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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67521843b8c157974b930a12d82cfed317ca61c4370902d3a356b5e23b94cc8c' 
  AND token = 'R6znYe9+V0BkaDbnNnSQ7ATsKe5cQ39aRnZg7nLkHiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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