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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52f2004caefcc007992a6a65e44466d804beccf3c90db90f506f402169519a2' 
  AND token = 'mK5DvPPo2pIS+uUolxhCqhhNgnikBQkxZUOI+0t1xMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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