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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbe7ffa19a161180b0d3f8054a2c4b83d6101bd101f56b0cf931e028ef816f5' 
  AND token = 'hB6AR7PS4Dw9N8hY7doBg4Rpz33XjCrSMy241vIuOM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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