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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd1a98b1079963ac7d496c5c2fbc85e61b1dc9395ad822e29aa3941ccb8e6dd' 
  AND token = 'BV8C+Za49hxloJyT5CtqhFo3Uf53gmyDrNnpraTFjcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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