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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111f12d4c82df95d603db13336b71a1cb3fd18028560482b710013114a18536f' 
  AND token = 'zgdoIwoVn11PmAMu/B6TL+cJBM63R7Y4f3fudKgYPeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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