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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062d36dfba8cc51b2a902e68bfa411046a8bf7cab8a5b4ec6afc994368eba2ef' 
  AND token = '4fmw0BdbZk6Bzqt2MazCzQi02ltAVgmqkaWEo8+6fHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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