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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87efd441779508e193ef991fbffb852bdd1b54dd995dd366b66d46630d2b9fbf' 
  AND token = 'V4K0eJRk5Y9v6V3sTSxvOT0NytfaNrKheCZB6YO5Nqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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