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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f19134b4115edc0b5f98c28796da2fa0a7331fa968773d7df9c1d56010989f4' 
  AND token = 'WTxrI7OaDc2n0bfDfgUEpOWtlMLCSCSGHU6VUK/QYPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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