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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d7ee626ad297501f9801dd859878ac4b491194cfd11508828560100001e0f9' 
  AND token = 'Q/VE4Fnmyc+U5/R8exBBQcR8LnQv9PL4b6lkwFhPXh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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