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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f47e7515f4db2e1f7ae92bcdea7082fc6e076a09cf5c048d5815ab8884e4c0f' 
  AND token = 'l4yFVp7gJPPxLY/4IGYxxwz8b/o9bNBzCvQAOfMQL8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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