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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6cf2340e97dc227a61b9509e8432afb4de8adb591aa93a25c99f2937e64a2e1' 
  AND token = 'iA3Jygo+WUEMUmxDC2mVj24U5Ln4d/osTlAyS/lbNls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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