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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e18db9d09fa2dfd797f02081ce84ef76276b3a815d1276cb7ace049eb64a44b' 
  AND token = '623DeeMqUoPrmew/wgbx4NAQZxsnauhCF6da38/JIbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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