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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0214b59cafadf6d6d46d5769a43d38020a0f8c64d5fabc6d0ec1bf442fdc11d' 
  AND token = '8eJNeShu8MtV73yzknRPomC91LpSdbSRoVZnuNNzzho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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