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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5438af6b8420fb955959919e1f3a1410486ee145c1c7c0ffb98881092cbec0a8' 
  AND token = 'FXLpth86A3qzh8jG3mx0pxhudw1Ub3bpH62u63fw+V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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