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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '759822ccf30fadfdb6b2ff9989f32b25ba262e351711e203dd2d82719fc97e26' 
  AND token = 'EduWxkjcBtMr13W52F8q+I6vG/UwzfSmcyzzpasb3dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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