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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de02ead38f13c8e5eb61d65ad05720a00aabd365560a63fb4a761cdd23c71a8' 
  AND token = 'Nfb5Tx2VIOWDlKoPG9MTsPO+SOrxrBCY0mAgpJOT2Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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