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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eba299609b5b66b6f63c3b574536212711d0879afb8b8918c84c5f79bac2192' 
  AND token = 'p5WpUUUMhy1ho8DLo77Y9mhBjrhGxiaDzsZdeRzBuck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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