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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0309cbf5be2038f70e47ea9b2aefeabeb7307f6b2e1a01b187e908e134afaeab' 
  AND token = 'cY7AaYVYvmKyIN27ksayh+56WxCg6A8dDjNbWiEVYOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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