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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d33caa61dddf70d5e8eefe912090ba27f0c40988015b519e7eecec344b7c780' 
  AND token = 'lN8VPNcffFLzGuUGgW6ay3A81Wpm0y83/KB11iXGIqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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