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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6e1059898a6f59090920a45e5cc0959ac8d2baa82ecff1e3c0208ff428e788' 
  AND token = 'gG2nRnYLYMPKtLXDtP3JhIhlsxzwV08pN+fl+dnoATs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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