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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d9002542449ff088b7a5ca75e45766d944ec720153cb473cc0e45b110386c0' 
  AND token = '+w16pzgaWJtWLQb1sW2QbiJe7KLsiI4Ospsp6ak8bEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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