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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b734761ff4d44082bf24733f85f7ec8358115acc07243193cf429baa3d44dd' 
  AND token = 'LxX59MHcZ/VbgvO/xtHPH9TIjVLgXecbfFrMea734ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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