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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667f9812f44a44f0c3611ce2737c34f0323b2df6623a9c91d67d26508ea01878' 
  AND token = '62vnveMhXZ6U7/98cMi5jCsIWIijhvA0XB7AJARj+2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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