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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbc6701e2cf0eea84dbf79c7e6741e4d96dffd79b73b68a77dfacf669b9060c' 
  AND token = 'YhOEGJXkkkSDUb//m6bbXPviixb2d4q0sTtQ4Kt9xSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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