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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4d7600e5a544ea8f8ea847bf466131b1e381ac5782e6144f0f39bb6fe97f76' 
  AND token = 'H0n9vYP83NAO70cOnDdnFCnkkoMUXx2wf9JD1CY2oRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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