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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf5703b5ef351fe586d2fbcd3d06367f75a7bc74e6212c12c6fdad1d20d8aa5' 
  AND token = 'OrRBVuCNou789A+1k7wu9SvbH0amiBC3KzhhyaclRrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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