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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15512d9206e445c0b412a6136c98e05fd5b3f59b72ac865b7e0aa28ab1a6aa92' 
  AND token = '5EONsoUcHoAy1NHpqfjfK5xfyB1Lm4TL946nxIdOyYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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