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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb19393eca209754600fb5f086806820d45b4a3f64fcb01e1cff35520ec15e6' 
  AND token = 'L+zxGKLmsD+Ork0Fml1v1/SS5vcwa0pOiOiM+9q1B0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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