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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bcddf1af5ce20b663c444c473b3d80b4b2ece58368d5dcdcd8d4b7a574e13f' 
  AND token = 'Ef1/Ykgk3dVNBYlzk5XS+8Tc7I/ONPD01lhR+Ak9zpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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