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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68f06fb8ba86bbbe66ae7c05304f20ace2167a7ad905911849ecb8567d90b5a' 
  AND token = 'Z2UM6l7j4aFiI9g8H61rlGmdVIkff9qUfNlQQpjEiDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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