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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06992758eb594406a00d090a43a688395637e18a67c0d08d6f23482f3d13041' 
  AND token = 'Uss3CxM3maH6SV7J+CffIUH7xC4yZybhyF1RTbjDuAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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