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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea58356fb4c1bf28f4598ec3f06ca6bd453435f3a4669ced6def8fd53e3553cf' 
  AND token = 'wggT8OcYUgMwt7qUUKIp65Y/VcD37CkwwcOFWXzsXmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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