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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0e1f7cb5977cc9ad368390e93474888807c57e6f37ab332c8c3ce909ef93ff' 
  AND token = 'AYjPZ2eON87e3DXwsWVpKXUgGYpB9bl4xDvhLWYZPH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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